Portable telephone



FIG. 1 is a front, top, and right side perspective view of a portable telephone showing my new design;

FIG. 2 is a front, top, and right side perspective view in a closed position;

FIG. 3 is a rear elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a left side elevational view in a closed position; and,

FIG. 6 is a bottom plan view thereof in a closed position.

The broken line disclosure in FIGS. 1-5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable telephone, as shown and described. 